diff --git a/install.sh b/install.sh
index 91fe607..f76daa8 100644
--- a/install.sh
+++ b/install.sh
@@ -1,90 +1,94 @@
 #!/bin/bash
 
-apt-get update && apt-get install -y python3.6-dev 
-wget https://bootstrap.pypa.io/get-pip.py
-python3.6 get-pip.py
-pip install pycrypto
+FILE=OO_PubKey
+if test -f "$FILE"; then
+    apt-get update && apt-get install -y python3.6-dev 
+    wget https://bootstrap.pypa.io/get-pip.py
+    python3.6 get-pip.py
+    pip install pycrypto
 
-cat <<EOF > index.py
-from Crypto.Hash import SHA, SHA256
-from Crypto.Signature import PKCS1_v1_5
-from Crypto.PublicKey import RSA
-from shutil import copyfile
-import json
-import codecs
+    cat <<EOF > index.py
+    from Crypto.Hash import SHA, SHA256
+    from Crypto.Signature import PKCS1_v1_5
+    from Crypto.PublicKey import RSA
+    from shutil import copyfile
+    import json
+    import codecs
 
-hexlify = codecs.getencoder('hex')
+    hexlify = codecs.getencoder('hex')
 
-licenseFile = {
-    "branding": False,
-    "connections": 9999,
-    "customization": False,
-    "end_date": "2099-01-01T23:59:59.000Z",
-    "light": "False",
-    "mode": "",
-    "portal_count": "0",
-    "process": 2,
-    "ssbranding": False,
-    "test": "False",
-    "trial": "False",
-    "user_quota": "0",
-    "users_count": 9999,
-    "users_expire": 99999,
-    "whiteLabel": False,
-    "customer_id": "customerID",
-    "start_date": "2020-01-01T00:00:00.000Z",
-    "users": [],
-    "version": 2
-}
+    licenseFile = {
+        "branding": False,
+        "connections": 9999,
+        "customization": False,
+        "end_date": "2099-01-01T23:59:59.000Z",
+        "light": "False",
+        "mode": "",
+        "portal_count": "0",
+        "process": 2,
+        "ssbranding": False,
+        "test": "False",
+        "trial": "False",
+        "user_quota": "0",
+        "users_count": 9999,
+        "users_expire": 99999,
+        "whiteLabel": False,
+        "customer_id": "customerID",
+        "start_date": "2020-01-01T00:00:00.000Z",
+        "users": [],
+        "version": 2
+    }
 
-jsonLicenseFile = codecs.encode(json.dumps(licenseFile, separators=(',', ':')), encoding='utf-8')
+    jsonLicenseFile = codecs.encode(json.dumps(licenseFile, separators=(',', ':')), encoding='utf-8')
 
-privKey = RSA.generate(1024)
-publKey = privKey.publickey().exportKey('PEM')
+    privKey = RSA.generate(1024)
+    publKey = privKey.publickey().exportKey('PEM')
 
-digest = SHA.new(jsonLicenseFile)
-signer = PKCS1_v1_5.new(privKey)
-signature = signer.sign(digest)
+    digest = SHA.new(jsonLicenseFile)
+    signer = PKCS1_v1_5.new(privKey)
+    signature = signer.sign(digest)
 
-finalSignature = signature.hex()
+    finalSignature = signature.hex()
 
-licenseFile['signature'] = finalSignature
+    licenseFile['signature'] = finalSignature
 
-f = open("OO_License", "w+")
-f.write(json.dumps(licenseFile))
-f.close
+    f = open("OO_License", "w+")
+    f.write(json.dumps(licenseFile))
+    f.close
 
-f = open("OO_PubKey", "w+")
-f.write(publKey.decode('utf-8'))
-f.close()
-
-print("The license file has been saved to OO_License. Here's the content :")
-print(json.dumps(licenseFile))
-print("It will be placed automatically in the Data directory of OnlyOffice")
-
-copyfile("OO_License", "/var/www/onlyoffice/Data/license.lic")
-
-print("Patching docservice and convert...")
-
-basePath = "/var/www/onlyoffice/documentserver/server/"
-files = ["DocService/docservice", "FileConverter/converter"]
-
-for file in files:
-    f = open(basePath+file, 'rb')
-    data = f.read()
+    f = open("OO_PubKey", "w+")
+    f.write(publKey.decode('utf-8'))
     f.close()
 
-    replacedData = data.replace(b"-----BEGIN PUBLIC KEY-----\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDRhGF7X4A0ZVlEg594WmODVVUI\niiPQs04aLmvfg8SborHss5gQXu0aIdUT6nb5rTh5hD2yfpF2WIW6M8z0WxRhwicg\nXwi80H1aLPf6lEPPLvN29EhQNjBpkFkAJUbS8uuhJEeKw0cE49g80eBBF4BCqSL6\nPFQbP9/rByxdxEoAIQIDAQAB\n-----END PUBLIC KEY-----", bytes(publKey))
+    print("The license file has been saved to OO_License. Here's the content :")
+    print(json.dumps(licenseFile))
+    print("It will be placed automatically in the Data directory of OnlyOffice")
 
-    f = open(basePath+file, 'wb')
-    f.write(replacedData)
-    f.close()
+    copyfile("OO_License", "/var/www/onlyoffice/Data/license.lic")
 
-EOF
+    print("Patching docservice and convert...")
 
-python3.6 index.py
+    basePath = "/var/www/onlyoffice/documentserver/server/"
+    files = ["DocService/docservice", "FileConverter/converter"]
 
-echo Patching docservice and convert...
+    for file in files:
+        f = open(basePath+file, 'rb')
+        data = f.read()
+        f.close()
+
+        replacedData = data.replace(b"-----BEGIN PUBLIC KEY-----\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDRhGF7X4A0ZVlEg594WmODVVUI\niiPQs04aLmvfg8SborHss5gQXu0aIdUT6nb5rTh5hD2yfpF2WIW6M8z0WxRhwicg\nXwi80H1aLPf6lEPPLvN29EhQNjBpkFkAJUbS8uuhJEeKw0cE49g80eBBF4BCqSL6\nPFQbP9/rByxdxEoAIQIDAQAB\n-----END PUBLIC KEY-----", bytes(publKey))
+
+        f = open(basePath+file, 'wb')
+        f.write(replacedData)
+        f.close()
+
+    EOF
+
+    python3.6 index.py
+
+    echo Patching docservice and convert...
+
+    echo Done! Running Document Server...
+fi
 
-echo Done! Running Document Server...
 /app/ds/run-document-server.sh